1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

A/C-Heater System DTCS

A/C-HEATER SYSTEM DTCS

OEM Code Description
11 IN-VEHICLE TEMPERATURE SENSOR CIRCUIT
12 AMBIENT TEMPERATURE SENSOR CIRCUIT
13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT
14 COOLANT TEMPERATURE SENSOR CIRCUIT
21 SOLAR SENSOR CIRCUIT
22 COMPRESSOR LOCK SENSOR CIRCUIT
23 PRESSURE SWITCH CIRCUIT
31 AIR MIX DOOR POSITION SENSOR CIRCUIT
32 AIR INLET DOOR POSITION SENSOR CIRCUIT
33 AIR OUTLET DOOR POSITION SENSOR CIRCUIT
41 AIR MIX DOOR POSITION SENSOR CIRCUIT
41 AIR MIX DOOR SERVOMOTOR CIRCUIT
42 AIR INLET DOOR POSITION SENSOR CIRCUIT
42 AIR INLET DOOR SERVOMOTOR CIRCUIT
43 AIR OUTLET DOOR POSITION SENSOR CIRCUIT
43 AIR OUTLET DOOR SERVOMOTOR CIRCUIT
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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